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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2003 The Open Group, All Rights Reserved --><title>siginterrupt</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="siginterrupt"></a> <a name="tag_03_687"></a><!-- siginterrupt --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_687_01"></a>NAME</h4><blockquote>siginterrupt - allow signals to interrupt functions</blockquote><h4><a name="tag_03_687_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/signal.h.html">signal.h</a>><br><br> int siginterrupt(int</tt> <i>sig</i><tt>, int</tt> <i>flag</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]" border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_687_03"></a>DESCRIPTION</h4><blockquote><p>The <i>siginterrupt</i>() function shall change the restart behavior when a function is interrupted by the specified signal. Thefunction <i>siginterrupt</i>(<i>sig</i>, <i>flag</i>) has an effect as if implemented as:</p><pre><tt>int siginterrupt(int sig, int flag) { int ret; struct sigaction act;<br> (void) sigaction(sig, NULL, &act); if (flag) act.sa_flags &= ˜SA_RESTART; else act.sa_flags |= SA_RESTART; ret = sigaction(sig, &act, NULL); return ret;}</tt></pre></blockquote><h4><a name="tag_03_687_04"></a>RETURN VALUE</h4><blockquote><p>Upon successful completion, <i>siginterrupt</i>() shall return 0; otherwise, -1 shall be returned and <i>errno</i> set toindicate the error.</p></blockquote><h4><a name="tag_03_687_05"></a>ERRORS</h4><blockquote><p>The <i>siginterrupt</i>() function shall fail if:</p><dl compact><dt>[EINVAL]</dt><dd>The <i>sig</i> argument is not a valid signal number.</dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_687_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_687_07"></a>APPLICATION USAGE</h4><blockquote><p>The <i>siginterrupt</i>() function supports programs written to historical system interfaces. A conforming application, whenbeing written or rewritten, should use <a href="../functions/sigaction.html"><i>sigaction</i>()</a> with the SA_RESTART flaginstead of <i>siginterrupt</i>().</p></blockquote><h4><a name="tag_03_687_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_687_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_687_10"></a>SEE ALSO</h4><blockquote><p><a href="xsh_chap02_04.html#tag_02_04"><i>Signal Concepts</i></a> , <a href="sigaction.html"><i>sigaction</i>()</a> , the BaseDefinitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/signal.h.html"><i><signal.h></i></a></p></blockquote><h4><a name="tag_03_687_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4, Version 2.</p></blockquote><h4><a name="tag_03_687_12"></a>Issue 5</h4><blockquote><p>Moved from X/OPEN UNIX extension to BASE.</p></blockquote><h4><a name="tag_03_687_13"></a>Issue 6</h4><blockquote><p>IEEE Std 1003.1-2001/Cor 1-2002, item XSH/TC1/D6/59 is applied, correcting the declaration in the sampleimplementation given in the DESCRIPTION.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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